For questions on connecting devices together so that they can communicate with each other, as well as on networking equipment such as routers and switches.

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0
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2answers
636 views

Synergy+ client keeps retrying bad or old or ??? server IP addresses

Synergy client keeps searching bad or old IP addresses for my Server (which is a laptop, with DHCP gets new IP regularly). Also my laptop has a couple "bad" ipaddress which are visible to other PC's ...
3
votes
1answer
652 views

I want uTorrent to use one ISP, and all other applications to use another ISP

I have a Windows 7 based desktop with two LAN cards (NICs): NIC1 is connected to a router, which connects to a reliable ISP with a low data cap (Fair Usage Policy). NIC2 is connected to an ADSL ...
2
votes
1answer
118 views

Internet access with an air card and no lan

How do I set up my system to access the Internet through a USB air card and disable it through the LAN. I'll need to access the LAN for files and folders only.
4
votes
1answer
2k views

Access a Mac via hostname.local from a Windows PC

I'm the only Windows user at my workplace full of Macs. Of course, being the only person with a different setup, I'm often left to do my own IT troubleshooting. The issue I have is that everyone's ...
1
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2answers
88 views

setup a home server

I have a desktop computer running Windows XP and a laptop on Windows 7. I am also sharing my internet connection between the two by means of a wireless router. This wireless router is connected to the ...
3
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1answer
4k views

Adding a second network card (dedicated connection to a network music streaming device) to a PC already on a home wireless network

I have a pretty normal home wireless network with a combined adsl modem/router which all my (Windows XP/Vista) computers use DHCP to connect wirelessly to and share resources among each other in a ...
1
vote
1answer
677 views

Host only adapter with guest external access

I want to configure my VirtualBox guest(s) (Fedora 13) to have connectivity to Internet through the host(also Fedora 13) with the same IP(for example: guest1 with IP 192.168.50.101 should appear to ...
2
votes
3answers
8k views

About MTU settings in machines and switch

Update: to be more realistic: M1 Switch and M2 are all running on a 10G network, and we use ipv4. The settings are: M1 has MTU set to 1500 Switch has MTU set to 9000 M2 has MTU set to 9000 Does ...
1
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2answers
806 views

How do I stop Windows 7 from changing the path of a shortcut to a mapped drive if the drive shows as disconnected?

How do I stop Windows 7 from changing the path of a shortcut to a mapped drive if the drive shows as disconnected? I have cases where I need to map a drive to a folder on the same machine. For some ...
3
votes
2answers
422 views

bittorrent upload with closed ports

I just downloaded a linux image using bittorrent. Although the port seems to be closed I noticed that my client was also uploading. As far as I know UPNP and NAT-PMP are disabled in my current network....
2
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2answers
164 views

Check available network ports in Windows

Administrator is blocking some network ports, but some are left open (e.g. 80). Is there a portable utility to check what ports are blocked? Using Windows 7 32-bit
8
votes
3answers
1k views

Windows 7 network settings profiles

I would like to have various "profiles" for my network settings -- one for work, one for home network, etc. Changing a "network profile" would change my IP address and DNS server address for a network ...
3
votes
4answers
196 views

How to upgrade, if at all

I have a Dell Dimension E510 running Windows XP. Its most important gaming specs are: Intel Pentium 4 3.0GHz CPU 1 GB of RAM (with a max of 4 GB) ATI Radeon X300 with 128 MB Typically I enjoy ...
1
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0answers
612 views

Windows 7 - Changing domain prefix for different wired networks?

I have two wired networks that I connect to regularly with my laptop. Both of them have different DNS servers My home network has a router that I have configured with DNSMasq, and I use a static ...
0
votes
1answer
962 views

How to access Verizon FiOS Router when it is acting as a network bridge with my own router?

I have Verizon FiOS and would like to access the router that Verizon provided. The problem is that I had Verizon hook up my router to it so I could set up my own wireless network with my own hardware. ...
11
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8answers
16k views

Linux Ping: Show time out

How can I make the Linux ping to show the requests 'time out' instead of omitting the output? Just like the Windows version of ping.
1
vote
0answers
697 views

Windows 7 Internet Connection Dropping Randomly

Recently installed Windows 7, and everything is fine, except that my internet connection is now dropping randomly. I've checked around and see that this is a pretty common issue, but haven't found a ...
4
votes
3answers
8k views

iptables for transparent TCP proxy

Here's my situation. I have an iPad, a TiVo, and an dd-wrt router on my network, along with a machine that I'd like to use to sniff/decrypt draffic between the iPad and the TiVo. The iPad has an app ...
2
votes
2answers
3k views

resolv.conf gets refreshed on every reboot

I am running Ubuntu 10.10, and my network is configured using the Network Manager. I have made some changes to /etc/resolv.conf but these changes are refreshed back to how they were before on each ...
0
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2answers
294 views

different result while nmap scan a subnet

while running: nmap -n -PN -sT -T4 -p 445,139 10.0.40.0/24 i get: Interesting ports on 10.0.40.6: PORT STATE SERVICE 139/tcp filtered netbios-ssn 445/tcp filtered microsoft-ds if I ...
0
votes
3answers
306 views

usb network adapter not recognised by windows

i have a usb stick which you plug into a computer and then it gives you 3G internet access. The stick is working fine and works on another old laptop i have, but on my new laptop when i plug it in ...
2
votes
0answers
478 views

Why is my Subnet Mask 255.255.255.255?

I am connecting to Internet through my Nokia E71 on the EDGE network in India. Every time i connect to Internet my IP addess is 27.107.66.139 with a subnet mask of 255.255.255.255. What does that ...
1
vote
1answer
320 views

Suspicious redirection to russian pages. Is government spying us?

Recently when I browse some multi-language websites the default language for them is Russian. An example is www.amd.com which redirects me to the russian page http://www.amd.com/ru/Pages/AMDHomePage....
1
vote
1answer
372 views

multiple active network connections in windows xp

My phone is a Nokia-N900, and I find the most useful way to interact with it from my PC is by ssh. Luckily it is possible to switch out the usb-networking module in the devices kernel to make it ...
2
votes
1answer
1k views

Per application VPN settings on Mac (Snow Leopard)

I use a VPN tunnel to connect to a remote network on Snow Leopard. I set it up with the system settings for VPN and it works fine. Unfortunately, the VPN tunnel is used for all connections. Some ports ...
2
votes
3answers
6k views

DNS server is not responding

For the last week my Windows 7 laptop has been unable to connect to the Internet. When I tried to troubleshoot the issue I received the following warning: DNS server is not responding However ...
23
votes
2answers
56k views

How to block all traffic but one IP in Windows Firewall?

I'm trying to use Windows 7 firewall to block all outgoing and incoming traffic, from all IP's and for all protocals, except for UDP to and from one particular IP address. The reason why is because ...
3
votes
1answer
526 views

Firewall for controlling network traffic

I'm wondering if it is possible to have a firewall on Windows 7 that can only allow network traffic to one IP address, and from that one IP address? I'm using a VPN that tunnels all my internet ...
1
vote
1answer
720 views

Debian Squeeze + dist-upgrade + how to rollback

Recently, I have dist-upgrade on Debian Squeeze which runs my Proliant DL360 G5. After this, when the OS boots up I can see that there is a problem with udev - it's failing. Also, there is no network ...
3
votes
1answer
3k views

Mysterious shared server with same name appearing / disappearing

I have a mysterious and somewhat suspicious occurrence on my OSX Snow Leopard. Every now & then I get a shared network entry appear in the finder, and then disappear after say 5 minutes. The name ...
0
votes
1answer
408 views

DSL-2640R ADSL/Wireless Router Setup

We have a router operating in front of one computer which is separate from the rest of the network. Most of the time it operates fine but we find sometimes it loses connectivity, both internet ...
1
vote
3answers
5k views

Windows 7 backup network restore: “The network location cannot be reached, 0x800704CF”

When I try to restore from a backup image, I get this error. After I enter the network address (\\10.0.0.1\backup or \\z\backup), the wizard presents me with the network login dialog, which leads ...
32
votes
2answers
15k views

Are MAC addresses unique when coming out of the factory?

According to Wikipedia: A Media Access Control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment But how unique are ...
1
vote
1answer
2k views

Why does my Debian VMWare virtual machine lose all network connections ~15 minutes after boot?

I’m having a strange networking problem with a Debian (6) VMWare virtual machine on my Mac. Around 15 minutes after starting it up, I can no longer SSH into, view websites served from, or ping the VM. ...
6
votes
4answers
17k views

TCP Retransmission vs. TCP Fast Retransmission

In Wireshark I can see things that say "TCP Retransmission" and "TCP Fast Retransmission." What's the difference? How is Wireshark able to tell the difference?
1
vote
1answer
596 views

Server response in TCP 3-way handshake

A server normally responds with SYN ACK in a 3-way handshake. What would happen if it just responded with ACK?
4
votes
2answers
2k views

How to manually do a TCP handshake

Telnet can be used to manually do things that programs do automatically. When I connect to a server I noticed that it automatically does the 3-way handshake to establish a TCP connection. Can it be ...
0
votes
0answers
178 views

Windows 7 Network using different user

following problem: I have a windows 7 box and alot of xp boxes. Every xp box supplies a network drive. But my windows 7 box signs in with some user that has not got any privileges. Can I set a ...
0
votes
2answers
2k views

Mac to Mac SSH network problems

I tried having a friend and myself SSH each other so we could use the Say command to talk to each other in a fun cool way. We both had enabled remote login, but when the correct format was entered (...
2
votes
2answers
14k views

SSH Connection Limitations

I have a network of 100 machines, all with ubuntu Linux. Is there a limit to the number of machines that can connect to one single machine (at the same time)? For example, can I have 99 of my ...
2
votes
2answers
987 views

LAN hostname resolution

I have several computers running on my home LAN, and all are connected to one router. I'm running linux on some of the machines and Windows on the others. Without any configuration, I can ping a ...
2
votes
4answers
1k views

Multiple Machines: Share Data Using NFS / HTTP / FTP?

I have a network of 20 machines, all running Ubuntu 10.04. Each machine has about 200[GB] of data that I'd like to share with all other 19 machines for READ ONLY PURPOSES. The reading should be done ...
0
votes
1answer
2k views

Windows 7 not automatically detecting proxy settings; cannot connnect to the internet

I just recently installed Windows 7 SP 1 on my computer. However it failed, and I rolled back the installation, only to now have an error with my ethernet port, saying that I cannot connect, for the ...
1
vote
1answer
1k views

Telnet remote port on windows 7

On WinXP/Win2k3, we can use telnet to if tell remote port is open. Since there's no telnet on Win 7, is there any other lite utility can do this?
3
votes
2answers
1k views

Start a Network Connection from Shell (OSX)

How can I start a VPN connection (it's already all configured) from a shell on OSX? I have looked through the man entry on net but I don't think that's it. launchctl might be more promising... Edit: ...
2
votes
1answer
327 views

Automatically connecting to a network when the cable is plugged in

Is there a way to have linux connect to the network when the ethernet cable is plugged in? I'm using Gentoo Linux, and I haven't found the right setup for the conf/net that'll allow me to do that.
7
votes
3answers
6k views

Disable CISCO VPN client routing for selected subnet on Mac OS X

I'm using a Mac laptop and when I am connected to the CISCO VPN, all traffic is routed through the tunnel. However I need to run a VM (VirtualBox with Ubuntu as guest) for certain services. VM is ...
1
vote
1answer
759 views

Feedback to router users during access-restricted hours for DD-WRT

Following router schedule rules that I change often, the stock firmware on my D-Link 825NA rev. B redirects HTTP requests to a built-in "Access denied!" warning at appointed times. I just upgraded ...
0
votes
4answers
565 views

IP address classes, networks and hosts

This may seem like a basic question but I need to understand IP addresses. I don't understand why IP addresses are split into network (wires) and nodes (hosts | device). For example Class A has 8 ...
6
votes
3answers
15k views

How exactly does a proxy work?

If I want to connect to say, IP 100.100.100.100, Port 80, my computer will send a tcp packet with this adress into the wire. Now If I use a proxy server say, 200.200.200.200 Port 8080 (such kind of ...